c) (9x + 2) . 3 = 60

9x + 2 = 60 : 3

9x + 2 = 20

9x = 20 – 2

9x = 18

x = 18 : 9

x = 2

Vậy x = 2

 x = 2 bạn nhé!

Học tốt!

a. (9x+2).3=60

=> 9x+2=60:3

=> 9x+2=20

=> 9x=20-2

=> 9x=18

=> x=2

b. 814-(x-105)=615

=> x-105=814-615

=> x-105=199

=> x=199+105

=> x=304

c. 3^2x-1-2³=19

=> 3^2x-1=19+2³

=> 3^2x-1=27

=> 3^2x-1=3³

=> 2x-1=3

=> 2x=4

=> x=2.

120+[(999-9x):60].24=480 

[(999-9x):60].24 = 480 - 120 

[(999-9x):60].24 = 360

[(999-9x):60] = 360 : 24 

[(999-9x):60] = 15

(999-9x) = 15 x 60

(999-9x) = 900

9x = 999 - 900

9x = 99 

x = 99 : 9 

x = 11

120+[(999-9x):60]=480-120

[(999-9x):60].24=360

(999-9x):60=360:24

(999-9x):60=15

(999-9x)=15.60

999-9x=900

990x=900

x=990:900

x=?

a. (9x + 2).3 = 60

<=> 9x + 2 = 20

<=> 9x = 18

<=> x = 2

b. 71 + (26 - 3x):5 = 75

<=> (26 - 3x) : 5 = 4

<=> 26 - 3x = 4/5

<=> 3x = 26 - 4/5 

<=> x = 42/5

c. 2^x = 32

<=> 2^x = 2⁵

<=> x = 5

d. (x - 6)² = 9

<=> x - 6 = 3

<=> x = 9

a) \(\left(9x+2\right)\times3=60\)

\(\Rightarrow9x+2=60:3\)

\(\Rightarrow9x+2=20\)

\(\Rightarrow9x=20-2\)

\(\Rightarrow9x=18\)

\(\Rightarrow x=18:9\)

\(\Rightarrow x=2\)

Vậy x = 2

b) \(71+\left(26-3x\right):5=75\)

\(\Rightarrow\left(26-3x\right):5=75-71\)

\(\Rightarrow\left(26-3x\right):5=4\)

\(\Rightarrow26-3x=4\times5\)

\(\Rightarrow26-3x=20\)

\(\Rightarrow3x=26-20\)

\(\Rightarrow3x=6\)

\(\Rightarrow x=6:3\)

\(\Rightarrow x=2\)

Vậy x = 2

c) \(2^x=32\)

\(\Rightarrow2^x=2^5\)

\(\Rightarrow x=5\)

Vậy x = 5

d) \(\left(x-6\right)^2=9\)

\(\Rightarrow\orbr{\begin{cases}x-6=3\\x-6=-3\end{cases}}\Rightarrow\orbr{\begin{cases}x=9\\x=3\end{cases}}\)

Vậy x = 9 hoặc x = 3

_Chúc bạn học tốt_

2(4x+35)=510

4x+35=510:2

4x+35=255

4x=255-35

4x=220

  x=220:4

  x=55

vậy x=55

320+(413-x)=534

413-x=534-320

413-x=214

       x=413-214

       x=199

vậy x=199

(x-6)²=16

* (x-6)²=4²                (x-6)²=(-4)²

      x-6=4                      x-6=-4

         x=10                        x=2

vậy x=10 hoặc x=2

3(9x+2)=60

9x+2=60:3

9x+2=20

9x=18

  x=18:9

  x=2

vậy x=2

2(4X+35)=510

4X+35=510/2

4X+35=255

4X      =255-35

4X      =220

X=220/4

X=55

VẬY X    =55

a. 23 + 3x = 5⁶ : 5³

23 + 3x     = 5³

3x             = 5³ - 23

x               = 102 : 3

x               = 34

b. 541 + (218 - x) = 735

218 - x                 = 735 - 541

x                          = 218 - 194

x                          = 24

c. 9x + 2 = 60 : 3

9x           = 20 - 2

x             = 18 : 9

x             = 2